[issue20090] slight ambiguity in README.txt instructions for building docs

[Roundup Robot]

Roundup Robot added the comment:

New changeset 0ae254c11921 by Georg Brandl in branch '2.7':
Closes #20090: update Doc/README and the error message in sphinx-build.py to make
http://hg.python.org/cpython/rev/0ae254c11921

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nosy: +python-dev
resolution:  -> fixed
stage:  -> committed/rejected
status: open -> closed

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